Explosive engine of the internal-combustion type



A. K. SCHAAP.

EXPVLOSIVE ENGINE OF THE INTERNAL COMBUSTION TYPE. APPLICATION FILEDDEC. 18. 1920. RENEwED JAN. 18,1922.

l ,408,475 Patented Mar. 7, 1922.

f7 f y 5 mvENToR Alf/waff? 56AM/9p Q BY ` moan Y 90 UNITED STATES PATENTCFFICE.

EXPLOSIVE ENGINE 0F THE INTERNAL-COMBUSTION TYPE.

Specification of Letters Patent.

Application led December 18, 1920, Serial No. 431,546. Renewed January18, 1922. Serial No. 530,233.

To all lwho/m, t may concern:

Be it known that I, ALEXANDER K. SCHAAP, a citizen of the United States,and a resident of the city of New York,'county of Kings, and State ofNew York, have invented a new and usefuly Improvement in ExplosiveEngines of the Internal-Combustion Type, of which the following is aspeciication.

The object of my invention is to provide an improvement in engines ofthis type which will enable such engines to run more quietly and withoutdisruptive shocks which are 'ordinarily transmitted to crank shafts andcause an undesirable crystallization in the shaft, the piston and pistonrod of the engine. A further object is to save the bearings from thedisruptive action of blows. A

These and other objects are accomplished by my invention, one embodimentof which is hereinafter more particularly set forth.

For a more exact description of my invention, reference is to' be had tothe -accompanying drawings, forming a part hereof, in which Figure l isa side elevation, partially in section, of an engine provided with myimprovement.

Figure 2 is a side elevation of a wrist pin employed in such engine, andFigure 3 1s an end elevation of this wrist pin.

Throughout the various views of the drawlngs, similar referencecharacters designate similar arts. 1

My improve engine l is provided with the usual crank case 2 in which ismounted the conventional crank shaft 3 and on which is mounted thecylinders 4 each of which h as a piston 5 of the usual type, a wrist pin6 which connects its piston 5 to a piston rod 7 of the usual type. Eachpiston rod 7 is connected to the crank 3 in t-he conventional manner.

The wrist pin 6 is not a rigid wrist pin but is slightly elastic and isreferablv made in the form of a roller foun in the-Hyatt rollerbearings, that is, each wrist pin 6 is composed of a rod of spring steelbent under compression into a spiral form, as indicated. Each wrist pinmay be held in its piston 5 by means of a small retaining' ring 8 whichfits in a corresponding recess in the piston or in any other suitablemanner. In the preferred embodiment of my invention, the

piston rod 7 has its upper end fitting between two inwardly projectingbosses 9 of the piston 5 with the usual working fit.

When a wrist pin of the kind described is employed, as -above set forth,and the engine is in normal operation, the explosion of the mixed gasesabove the piston causes mot-ion to be transmit-ted from the piston 5 tothe piston rod 7 through a slightly elastic wrist pin with a very slightlost motion which cushions the action of the piston on plosive stroke,this cushioning effect is suf.

ficient to prevent disruptive Shocks from being transmitted from the'piston to the piston rod and through the piston rod to the connectedarts above specified.

The wrist pin 6 may be mounted in the piston rod 7 and piston 8 in anyconventional way as it may be made full floating l or held'in thecenter, or at either end, as desired.

While I have shown and described one embodiment of my invention, it isobvious that it is not restricted thereto, but is broad enough to coverall structures that come -within the scope of the annexed claims.

Having thus described my invention, what I claim is:

1. In an engine of the class described, a piston, a piston rod and anelastic wristl pin connecting the two.

2. In an engine of the class described` a piston, a piston rod and awrist pin connecting the two, said wrist in being composed oi a rodwound into a splral form.

3. In an engine of the class dcscribecha piston, a piston rod and aWrist pin connecting the two, the wrist pinv being formed in the shapeof a roller of a Hyatt roller bearing.

Intestimony whereof I have hereunto set my hand and seal November, 1920.

ALEXANDER K'. SCHAAP. l

Patented Mar. 7, 192e.

